I made a set out of 95A urethane... done maybe 10,000k
on them still tight as when I put them in...
I got a strip of 75X20 sheet off E-bay..Cut them to shape
with a hack saw..
I made them very tight..I thought I was not going to get
them in... enough pushing & rubber grease and they went
in ,in the end...

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...